So the response to the question of why I have five bicycles is that they are a bit like shoes. While one pair is all you really need (provided they are sensible enough), more specialised shoes, suitable for different things, make your journeys pleasanter or more fun.
So that got me thinking, what kind of shoe can I equate to what kind of bicycle...
My commuter bike is a sensible brogue (women's brogues also available). Solid. Heavy. Works in the wet. Dependable. Wouldn't want to walk miles in it.
My folding bike is an office shoe. Sensible, A bit dull. Good for a short trip on nice surfaces. Fits well under a desk.
My Elephant Bike is a pair of wellies.
My fancy titanium audax bike is...well I'm not sure what it is. A high-end running shoe? Not sure, somehow for it to be a running shoe it would need to be carbon.
My hipster fixie (if I had one) would be some kind of uncomfortable pointy-toed thing that was mainly style over substance. It would probably be suede. If I wore women's shoes I can imagine it would have a very high heel.
A gravel bike would be an on-trend trail shoe. In 2021 it will look very definitely like something from 2019.
Any further suggestions?